使用Java快速实现进度条

基于有人问到怎样做进度条，下面给个简单的做法：

主要是使用JProgressBar（Swing内置javax.swing.JProgressBar）和SwingWorker（Swing内置javax.swing.SwingWorker）

有人肯定会说，不是用线程做的吗？使用线程共享一个变量，确实可以。不过这种方式不太优雅，当然，你可以再用线程封装也行。不过，SwingWorker已经帮我们封装好啦～～使用现成的东西来做还是方便^_^

先看效果：

下面看代码：很简单,相信各位大大肯定是懂的～

package org.ubird;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.SwingWorker;

public class TestSwingWorker extends SwingWorker<List<Image>,String>{

	private JLabel status;
	private JPanel viewer;
	private String[] imagesName;
	private JProgressBar jpb;
	
	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable(){
			public void run() {
				TestFrame frame = new TestFrame();
				final JPanel panel = new JPanel();
				final JLabel label = new JLabel();
				
				final String[] imagesName = new String[38];
				for(int i=0; i<imagesName.length; i++){
					imagesName[i] = "res/1 ("+(i+1)+").jpg";
				}
				
				JScrollPane sp = new JScrollPane(panel);
				sp.setSize(new Dimension(700,500));
				frame.add(sp,BorderLayout.CENTER);
				
				JPanel stp = new JPanel();
				final JProgressBar jpb = new JProgressBar();
				jpb.setMinimum(1);
				jpb.setMaximum(imagesName.length);
				stp.add(jpb);
				stp.add(label);
				frame.add(stp,BorderLayout.SOUTH);
				
				JButton button = new JButton("load image");
				button.addActionListener(new ActionListener(){
					public void actionPerformed(ActionEvent e) {
						TestSwingWorker sw = new TestSwingWorker(label, panel, imagesName, jpb);
						sw.execute();
					}
				});

				frame.add(button,BorderLayout.NORTH);
				
				frame.setVisible(true);
			}
		});
	}
	
	public TestSwingWorker(JLabel status, JPanel viewer, String[] imagesName, JProgressBar jpb){
		this.status = status;
		this.viewer = viewer;
		this.imagesName = imagesName;
		this.jpb = jpb;
	}

	@Override
	protected List<Image> doInBackground() throws Exception {
		List<Image> image = new ArrayList<Image>();
		for(int i=0; i<imagesName.length; i++){
			image.add(ImageIO.read(getClass().getClassLoader().getResource(imagesName[i])));
			publish("已经加载了  "+(i+1)+"/"+imagesName.length+" : "+imagesName[i]);
		}
		return image;
	}

	@Override
	protected void process(List<String> chunks) {
		status.setText(chunks.get(chunks.size()-1));
		int x = Integer.parseInt(chunks.get(chunks.size()-1).substring(chunks.get(chunks.size()-1).indexOf("(")+1,chunks.get(chunks.size()-1).indexOf(")")).trim());
		jpb.setValue(x);
		
		for(String str : chunks){
			System.out.println(str);
		}
	}

	@Override
	protected void done() {
		try {
			for(Image image : get()){
				JLabel label = new JLabel(new ImageIcon(image));
				label.setSize(160, 120);
				label.setPreferredSize(new Dimension(160,120));
				viewer.add(label);
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		} catch (ExecutionException e) {
			e.printStackTrace();
		}
	}
	
	
}

package org.ubird;

import javax.swing.JFrame;

public class TestFrame extends JFrame {


	public TestFrame(){
		setTitle("Test Frame");
		setSize(800,600);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}

该程序的可运行源码、资源图片的下载地址：http://download.csdn.net/source/3245370

NOTE：解压后双击里面的：CompileAndRun.bat可在Win下直接运行